Multi-chamber runner profile liquid cooling plate, battery pack

Abstract

The utility model provides a kind of multi-chamber runner profile liquid cooling plate, battery pack, belong to battery pack liquid cooling technical field, comprising: center liquid cooling plate, water inlet connector, water outlet connector and first chamber runner are equipped on center liquid cooling plate, first chamber runner includes main runner, water inlet runner being communicated with water inlet connector and water outlet runner being communicated with water outlet connector;Water inlet side liquid cooling plate, second chamber runner is equipped on water inlet side liquid cooling plate, and second chamber runner is communicated with water inlet runner and main runner;Water outlet side liquid cooling plate, third chamber runner is equipped on water outlet side liquid cooling plate, and third chamber runner is communicated with main runner and water outlet runner, the width of both sides liquid cooling plate and the width of special-shaped battery pack match.Affinity effect: by using multi-chamber profile liquid cooling plate design, it can meet the layout requirement of special-shaped battery pack narrow space, while being able to carry out all-around cooling to battery pack inner electric core, improve the uniformity of electric core temperature, realize the consideration of bearing and cooling function.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling technology for battery packs, and in particular to a multi-chamber flow channel profile liquid cooling plate and a battery pack. Background Technology

[0002] In the field of new energy vehicles, thermal management of power batteries is crucial for ensuring battery performance, extending service life, and improving safety. As a key component of the thermal management system, the performance and design of the liquid cooling plate directly affect the operation of the entire battery system. In some projects, such as those with a large number of battery cells occupying a large internal space in the battery pack, the liquid cooling plate is required not only to bear weight but also to have the ability to cool all the cells, which increases the difficulty of designing the shape of the liquid cooling plate.

[0003] In power battery pack designs with load-bearing requirements, profiled liquid cooling plates are the optimal solution. Profiled liquid cooling plates are a commonly used liquid cooling plate arrangement in the new energy vehicle industry. Manufactured using an extrusion molding process, the production technology is mature, and due to their load-bearing structure, they are frequently used in power battery pack designs requiring load-bearing capacity. The internal chamber of the profiled liquid cooling plate is filled with a refrigerant with good thermal conductivity, which circulates through a cooling circuit. Simultaneously, thermally conductive adhesive or pads are laid between the profiled liquid cooling plate and the battery cells. The heat generated by the battery cells during operation is first transferred to the profiled liquid cooling plate via the thermally conductive medium, and then the continuous circulation of the refrigerant within the profiled liquid cooling plate carries away the heat, ultimately achieving cell cooling through heat exchange. Common profiled liquid cooling plates have a thickness of 8mm and an internal flow channel height of 4mm.

[0004] With the advancement of the "oil-to-electric" trend in the automotive industry, the available space for power battery packs has been compressed to the extreme without major changes to the overall vehicle frame structure. This results in a relative reduction in the space available for liquid cooling plates within the power battery pack, increasing the difficulty of designing battery pack thermal management solutions. Due to the compressed space for liquid cooling plates, conventionally shaped profile liquid cooling plates are insufficient to meet the placement requirements, and the flow channel arrangement of single-chamber profile liquid cooling plates is too simplistic, making it difficult to consider a solution for global temperature uniformity of the battery cells.

[0005] by Figure 1 Taking the irregularly shaped power battery pack 100 as an example, due to the trend of "converting from gasoline to electric" in the automotive industry, the available space in the power battery pack design is irregular and narrow, with its outer envelope contour changing from wide to narrow. Due to the limitations of the extrusion molding process, the central liquid cooling plate can only support and cool the cells in the central area, making it difficult to take care of the areas on both sides. The single-chamber liquid cooling plate structure can no longer meet the current needs. Utility Model Content

[0006] To solve the above technical problems, this utility model provides a multi-chamber flow channel profile liquid cooling plate; on the other hand, it also provides a battery pack.

[0007] The technical problem solved by this utility model can be achieved by the following technical solution:

[0008] A multi-chamber flow channel profile liquid cooling plate, comprising:

[0009] A central liquid cooling plate is provided with an inlet connector, an outlet connector, and a first chamber flow channel. The first chamber flow channel includes a main flow channel, an inlet flow channel communicating with the inlet connector, and an outlet flow channel communicating with the outlet connector.

[0010] A water inlet side liquid cooling plate is connected to the side of the central liquid cooling plate near the water inlet channel. The water inlet side liquid cooling plate is provided with a second chamber flow channel, which is connected to the water inlet channel and the main flow channel.

[0011] The water outlet side liquid cooling plate is connected to the side of the central liquid cooling plate near the water outlet channel. The water outlet side liquid cooling plate is provided with a third chamber flow channel, which is connected to the main flow channel and the water outlet channel. The width of the water inlet side liquid cooling plate and the water outlet side liquid cooling plate are matched with the width of the irregular battery pack.

[0012] Preferably, the connection points between the central liquid cooling plate and the inlet-side liquid cooling plate and the outlet-side liquid cooling plate are respectively provided with flow channels to connect the second chamber flow channel to the inlet flow channel and the main flow channel, and to connect the third chamber flow channel to the main flow channel and the outlet flow channel.

[0013] Preferably, the central liquid cooling plate is further provided with a baffle bar, which is located in at least one of the water inlet channel and the water outlet channel and is located downstream of the corresponding diversion channel, and the baffle bar is arranged along the width direction of the channel.

[0014] Preferably, the baffle bar has a stepped structure, and the dimensions at both ends of the baffle bar are larger than the dimensions in the middle.

[0015] Preferably, the height of the inlet channel is less than the height of the main channel; and / or

[0016] The height of the outlet channel is less than the height of the main channel.

[0017] Preferably, the width of the inlet channel and / or the outlet channel is greater than the width of the main channel; and / or

[0018] The width of the inlet channel and / or the outlet channel is greater than the width of the second chamber channel; and / or

[0019] The width of the inlet channel and / or the outlet channel is greater than the width of the third chamber channel.

[0020] Preferably, the inlet channel and / or the outlet channel are cut off at their tail ends, and the height of the channel that merges with the cut-off point is the same as the height of the inlet channel and / or the outlet channel.

[0021] Preferably, the flow channel edges of the central liquid cooling plate, the inlet-side liquid cooling plate, and the outlet-side liquid cooling plate are all provided with plugs.

[0022] Preferably, it further includes: a frame, the frame being arranged around the edge of the central liquid cooling plate, the inlet-side liquid cooling plate and the outlet-side liquid cooling plate after assembly, and the plug being integrated on the frame.

[0023] On the other hand, a battery pack is also provided, including at least one cell and / or at least one set of modules, including the aforementioned multi-chamber flow channel profile liquid cooling plate.

[0024] The advantages or beneficial effects of this utility model's technical solution are as follows:

[0025] This invention modifies the single-chamber profile liquid cooling plate design into a multi-chamber profile liquid cooling plate design with two side liquid cooling plates added to the central liquid cooling plate. This design meets the arrangement requirements of narrow spaces in irregularly shaped battery packs, solves the problem of liquid cooling plate arrangement caused by space compression and irregular shape of power battery packs, and improves space utilization. The multi-chamber design provides a wider cooling range, enabling all-round cooling of the battery cells inside the battery pack, avoiding local overheating, improving the temperature uniformity of the cells, and thus improving battery performance and service life. Moreover, this design retains the load-bearing function of the profile liquid cooling plate while meeting space and cooling requirements, achieving a balance between load-bearing and cooling functions, and has broad application prospects. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an irregularly shaped power battery pack in the existing technology;

[0027] Figure 2 This is a schematic diagram of the flow field pressure distribution of the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the coolant flow velocity distribution inside the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of the present invention;

[0030] Figure 5 This is a partial disassembly diagram of the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of the present invention.

[0031] Figure 6 In a preferred embodiment of this utility model, Figure 5 Enlarged structural diagram of region A in the middle;

[0032] Figure 7 This is a schematic diagram of the structure of the turbulence bar in a preferred embodiment of the present invention;

[0033] Figure 8 In a preferred embodiment of this utility model, Figure 5 Enlarged structural diagram of region B in the middle;

[0034] Figure 9 In a preferred embodiment of this utility model, Figure 5 Enlarged structural diagram of region C in the middle;

[0035] Figure 10 This is a schematic diagram of the refrigerant flow direction in a preferred embodiment of the present invention.

[0036] Figure 11 This is a schematic diagram of the welding of the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of the present invention.

[0037] Figure 12 A schematic diagram of the NTC temperature change curve of the multi-chamber flow channel profile liquid cooling plate in a preferred embodiment of this utility model;

[0038] Figure 13 In a preferred embodiment of this utility model, the cell temperature distribution cloud map of the multi-chamber flow channel profile liquid cooling plate is shown. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0042] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a multi-chamber flow channel profile liquid cooling plate is provided, such as... Figure 4 and Figure 5 As shown, it includes:

[0043] The central liquid cooling plate 1 is provided with a water inlet connector 4, a water outlet connector 5 and a first chamber flow channel. The first chamber flow channel includes a main flow channel 11, a water inlet flow channel 12 connected to the water inlet connector 4 and a water outlet flow channel 13 connected to the water outlet connector 5.

[0044] The inlet side liquid cooling plate 2 is connected to the side of the central liquid cooling plate 1 near the inlet flow channel 12. The inlet side liquid cooling plate 2 is provided with a second chamber flow channel 21, which is connected to the inlet flow channel 12 and the main flow channel 11.

[0045] The outlet liquid cooling plate 3 is connected to the side of the central liquid cooling plate 1 near the outlet flow channel 13. The outlet liquid cooling plate 3 is provided with a third chamber flow channel 31, which is connected to the main flow channel 11 and the outlet flow channel 13. The width of the inlet liquid cooling plate 2 and the outlet liquid cooling plate 3 matches the width of the irregular battery pack.

[0046] Specifically, in this embodiment, the liquid cooling plates are all extruded from aluminum profiles.

[0047] However, due to the limitations of the extrusion molding process, the central liquid cooling plate 1 of the single-chamber liquid cooling plate design can only support and cool the cells in the central area, and it is difficult to take care of the two sides. The single-chamber liquid cooling plate structure can no longer meet the needs of the current irregular and narrow power battery packs.

[0048] In this embodiment, the single-chamber liquid cooling plate design is changed to a multi-chamber liquid cooling plate design to meet the requirements of irregular and narrow space arrangement. Specifically, based on the central liquid cooling plate 1, an inlet-side liquid cooling plate 2 and an outlet-side liquid cooling plate 3 are added. The inlet-side liquid cooling plate 2 and the outlet-side liquid cooling plate 3 are arranged on both sides of the central liquid cooling plate 1. The dimensions of the inlet-side liquid cooling plate 2 and the outlet-side liquid cooling plate 3 match the dimensions of the irregular and narrow areas on both sides of the irregular power battery pack 100, so that the combined size of the central liquid cooling plate 1 and the liquid cooling plates on both sides matches the overall size of the irregular power battery pack 100. This can provide support for the cells in the irregular and narrow areas on both sides, avoid deformation risk due to local pressure concentration, and extend service life.

[0049] In this embodiment, the inlet side liquid cooling plate 2 and the outlet side liquid cooling plate 3 are respectively provided with chamber flow channels. The chamber flow channels on the two side liquid cooling plates are connected to the flow channel of the central liquid cooling plate 1 to realize the circulation of coolant.

[0050] Specifically, such as Figure 5As shown, after the coolant enters the central liquid cooling plate 1 through the inlet connector 4, it flows along the inlet channel 12. During the flow, since the second chamber channel 21 on the inlet-side liquid cooling plate 2 is connected to the inlet channel 12, the coolant flowing along the inlet channel 12 will flow into the second chamber channel 21 of the inlet-side liquid cooling plate 2. In the second chamber channel 21, the coolant can absorb the heat generated by the irregularly shaped and narrow area of ​​the battery cell on one side.

[0051] Subsequently, the coolant flows along the inlet channel 12 and into the main channel 11 from its tail end. Simultaneously, since the second chamber channel 21 is connected to the main channel 11, the coolant along the second chamber channel 21 also flows into the main channel 11. In the main channel 11, the coolant absorbs the heat generated by the battery cells in the central region.

[0052] Next, since the main flow channel 11 is connected to the third chamber flow channel 31, the coolant will flow from the main flow channel 11 to the third chamber flow channel 31 of the outlet liquid cooling plate 3. In the third chamber flow channel 31, the coolant can absorb the heat generated by the irregular and narrow area of ​​the battery cell on the other side.

[0053] Finally, the coolant flows into the outlet channel 13 along the main channel 11. At the same time, since the third chamber channel 31 is connected to the outlet channel 13, the coolant flows from the third chamber channel 31 to the outlet channel 13, and finally flows out from the outlet connector 5, completing one cycle of coolant.

[0054] The coolant circulates in the connected channels, exchanging heat with the battery cells and carrying away the heat generated by the cells. This embodiment solves the problem of supporting and cooling the battery cells in the irregularly shaped and narrow areas on both sides of the irregularly shaped power battery pack 100 while simultaneously supporting and cooling the cells in the central area.

[0055] In a preferred embodiment, the connection between the central liquid cooling plate 1 and the inlet side liquid cooling plate 2 and the outlet side liquid cooling plate 3 is provided with a flow channel 7 to connect the second chamber flow channel 21 to the inlet flow channel 12 and the main flow channel 11, and to connect the third chamber flow channel 31 to the main flow channel 11 and the outlet flow channel 13.

[0056] Specifically, in this embodiment, by setting the flow channel 7, the flow channel of the central liquid cooling plate 1 is connected to the flow channels of the liquid cooling plates on both sides, thereby realizing the flow of coolant.

[0057] More specifically, the drainage channel 7 at the connection between the central liquid cooling plate 1 and the water inlet side liquid cooling plate 2 includes:

[0058] The first drainage channel is used to connect the water inlet channel 12 to the second chamber channel 21;

[0059] The second drainage channel is used to connect the second chamber flow channel 21 to the main flow channel 11;

[0060] When the coolant enters the inlet channel 12 of the central liquid cooling plate 1 from the inlet connector 4, it can flow to the second chamber channel 21 of the inlet side liquid cooling plate 2 under the guidance of the first drainage channel.

[0061] The coolant that has completed heat exchange through the second chamber flow channel 21 can flow into the main flow channel 11 under the guidance of the second drainage channel.

[0062] More specifically, the drainage channel 7 at the connection between the central liquid cooling plate 1 and the outlet liquid cooling plate 3 includes:

[0063] The third drainage channel is used to connect the main flow channel 11 to the third chamber flow channel 31;

[0064] The fourth drainage channel is used to connect the third chamber flow channel 31 to the outlet flow channel 13.

[0065] Similarly, the coolant that has completed heat exchange through the second chamber flow channel 21 can flow to the third chamber flow channel 31 of the outlet liquid cooling plate 3 under the guidance of the third flow channel.

[0066] The coolant that has completed heat exchange through the third chamber flow channel 31 can flow into the outlet flow channel 13 of the central liquid cooling plate 1 under the guidance of the fourth flow channel, and then flow out from the outlet connector 5.

[0067] More specifically, the flow channel 7 is formed by openings at the connection points between the central liquid cooling plate 1 and the inlet-side liquid cooling plate 2 and the outlet-side liquid cooling plate 3. Specifically, by making openings in the inlet or outlet flow channel 13 on the outermost side of the central liquid cooling plate 1, the purpose of flow diversion is achieved, thereby realizing the flow of coolant and other refrigerants between the central liquid cooling plate 1 and the two side liquid cooling plates.

[0068] In a preferred embodiment, plugs are provided on the flow channel edges of the central liquid cooling plate 1, the inlet-side liquid cooling plate 2, and the outlet-side liquid cooling plate 3.

[0069] Specifically, in this embodiment, plugs are provided at the edges of each flow channel of the liquid cooling plate to block the unnecessary openings at the ends of the flow channels, thereby achieving a sealing effect.

[0070] More specifically, in this embodiment, four plugs can be provided, including a first plug 61, a second plug 62, a third plug 63, and a fourth plug 64. Specifically, the first plug 61 is used to block the end of the central liquid cooling plate 1 near the inlet / outlet connector 5; the second plug 62 is used to block the end of the inlet-side liquid cooling plate 2 near the inlet / outlet connector 5; the second plug 63 is used to block the ends of the central liquid cooling plate 1, the inlet-side liquid cooling plate 2, and the outlet-side liquid cooling plate 3 away from the inlet / outlet connector 5; and the fourth plug 64 is used to block the end of the outlet-side liquid cooling plate 3 near the inlet / outlet connector 5.

[0071] Furthermore, each plug is connected to the liquid cooling plate using friction stir welding.

[0072] In a preferred embodiment, the system further includes a frame that surrounds the edges of the central liquid cooling plate 1, the inlet-side liquid cooling plate 2, and the outlet-side liquid cooling plate 3 after assembly, with the plug integrated on the frame.

[0073] Specifically, in this embodiment, the second plug 62, the third plug 63, and the fourth plug 64 are all integrated on the frame surrounding the boundary of the liquid cooling plate.

[0074] Furthermore, the frame consists of six side beams: a first side beam 91, a second side beam 92, a third side beam 93, a fourth side beam 94, a fifth side beam 95, and a sixth side beam 96. These six side beams sequentially enclose the frame. A second plug 62 is integrated onto the second side beam 92, a third plug 63 is integrated onto the fourth side beam 94, and a fourth plug 64 is integrated onto the sixth side beam 96. The second plug 62, third plug 63, and fourth plug 64 are welded to their respective integrated side beams using friction stir welding, thus forming part of the side beam. By integrating some plugs onto the side beams, high integration is achieved, while simultaneously reducing the complexity of part manufacturing and improving the connection accuracy between the side beam and the liquid cooling plate.

[0075] In this embodiment, the inlet-side liquid cooling plate 2 and the outlet-side liquid cooling plate 3 are completely identical in structural design and can be manufactured using the same set of molds. During the production of the side liquid cooling plates, there is no need to develop different molds separately; only the same mold is required to complete the process, reducing mold opening costs and improving production efficiency.

[0076] During the production and assembly process, the central liquid cooling plate 1 is manufactured by processing the central cold plate mold. The inlet connector 4 and the outlet connector 5 are assembled onto the central liquid cooling plate 1 by argon arc welding, and then polished. The inlet side liquid cooling plate 2 and the outlet side liquid cooling plate 3 are manufactured by processing the side liquid cooling plate mold. The inlet side liquid cooling plate 2, the outlet side liquid cooling plate 3 and the central liquid cooling plate 1 are then connected and assembled by friction stir welding. The assembled profile liquid cooling plate is then connected to the frame of the assembled plug by argon arc welding, thereby completing the assembly of the multi-chamber flow channel profile liquid cooling plate.

[0077] like Figure 2 As shown, the flow field pressure distribution of the multi-chamber flow channel profile liquid cooling plate in this embodiment is presented.

[0078] like Figure 3 The diagram illustrates the flow velocity distribution of the coolant within the multi-chamber liquid cooling plate of this embodiment. While improving the original single-chamber liquid cooling plate design to a multi-chamber design solved the problem of no flow on the side liquid cooling plates, from... Figure 3The velocity cloud map shows that the flow distribution on the two side liquid cooling plates is still very low, while the flow distribution on the central liquid cooling plate 1 is significantly higher, indicating a large difference in the overall flow distribution.

[0079] In order to increase the flow rate of the side liquid cooling plate and make the global flow distribution more uniform, another embodiment adds a baffle and changes the flow channel height.

[0080] like Figure 4 As shown, the multi-chamber flow channel profile liquid cooling plate is extruded from aluminum profiles and mainly consists of a central liquid cooling plate 1, an inlet-side liquid cooling plate 2, an outlet-side liquid cooling plate 3, an inlet connector 4, an outlet connector 5, first to fourth plugs, a first baffle rod 81 and a second baffle rod 82, and a frame. The design of the central liquid cooling plate 1, the inlet-side liquid cooling plate 2, the outlet-side liquid cooling plate 3, the inlet connector 4, the outlet connector 5, the first to fourth plugs, and the frame is the same as in Embodiment 1, and will not be repeated here.

[0081] The following section will elaborate on the design of the spoiler and the modification of the flow channel height:

[0082] In a preferred embodiment, such as Figure 5 As shown in region A, the central liquid cooling plate 1 is also provided with a baffle bar. The baffle bar is located in at least one of the inlet channel 12 and the outlet channel 13 and is located downstream of the corresponding diversion channel. The baffle bar is arranged along the width direction of the channel.

[0083] Specifically, in this embodiment, by setting a turbulence bar in the flow channel corresponding to the water inlet / outlet connector 5 of the central liquid cooling plate 1, the problem of low flow rate of the side liquid cooling plate and high flow rate of the central liquid cooling plate 1 is solved, so that the global flow distribution is more uniform.

[0084] Because the inlet / outlet channels of the central liquid cooling plate 1 have openings on the outside, the refrigerant can flow between the channels of the central liquid cooling plate 1 and the two side liquid cooling plates, so that the refrigerant flows from the central liquid cooling plate 1 to the side liquid cooling plates, thus achieving the purpose of diversion; and the baffle is set downstream of the opening, so as to reduce the flow rate of the inlet / outlet channels downstream of the opening of the central liquid cooling plate 1, thereby increasing the refrigerant flow rate of the channels of the two side liquid cooling plates, and finally reducing the temperature difference distribution between the side cells and the central cells, thus improving the temperature uniformity of the whole package.

[0085] It should be noted that, since the arrangement of the perforated drainage channels 7 and the baffles on both sides of the central liquid cooling plate 1 is the same, for the sake of simplicity, only one side is shown, as detailed below. Figure 6 As shown. The connection method between the liquid cooling plates on the opposite side of the central liquid cooling plate 1 and the liquid cooling plate on the water outlet side is the same as that shown on the water inlet side, and will not be shown again here.

[0086] Furthermore, only one baffle can be installed in a corresponding flow channel. For example, one baffle is installed in the inlet flow channel 12; similarly, one baffle is also installed in the outlet flow channel 13.

[0087] Furthermore, two or more baffles can be installed in a single flow channel. For example, two, three or more baffles can be installed in the inlet flow channel 12, and these baffles can be staggered and spaced on both sides of the inlet flow channel 12; similarly, two, three or more baffles can also be staggered and spaced in the outlet flow channel 13.

[0088] In this embodiment, one flow channel is equipped with one baffle bar as an example, including a first baffle bar 81 in the water inlet channel 12 and a second baffle bar 82 in the water outlet channel 13. The structural design of the first baffle bar 81 and the second baffle bar 82 is consistent.

[0089] In a preferred embodiment, such as Figure 7 As shown, the turbulence bar has a stepped structure.

[0090] Specifically, to avoid excessive flow obstruction by the baffle rod in the flow channel, which could lead to insufficient refrigerant flow, this embodiment designs the baffle rod as a stepped height structure. The stepped height baffle rod effectively controls the flow rate within the channel, preventing excessive, empty, or insufficient flow in the latter part of the channel, thereby ensuring that the cooling effect and temperature uniformity of the battery cell are not affected.

[0091] Furthermore, one end of the baffle is fixedly installed on the central liquid cooling plate 1 on one side of the inlet / outlet channel, and the other end of the baffle can be fixedly installed on the central liquid cooling plate 1 on the other side of the inlet / outlet channel, or it can be suspended in the inlet / outlet channel.

[0092] Furthermore, the central liquid cooling plate 1 has pre-drilled mounting holes. The end of the baffle rod is inserted into the pre-drilled mounting holes and then argon arc welding is performed to install the baffle rod.

[0093] In a preferred embodiment, the dimensions of the two ends 811 and 813 of the baffle are larger than the dimension of the middle 812.

[0094] Specifically, in this embodiment, the turbulence bar adopts a stepped height structure with large ends and small middle.

[0095] The diameters of the two ends 811 and 813 of the baffle bar should be slightly larger than the height of the inlet / outlet flow channel, while the diameter of the middle part 812 should be smaller than the height of the inlet / outlet flow channel. During installation, the two ends of the baffle bar can completely block the flow channel, acting as a limit and preventing the baffle bar from shifting. The thinner middle part allows for partial flow, thereby restricting the flow distribution in the flow channel.

[0096] For example, the diameters at both ends of the baffle are preferably 3.5 mm, and the diameter in the middle is preferably 2.5 mm.

[0097] like Figure 5 As shown in area B, in order to further optimize the flow distribution, the cross-sectional height of some flow channels was adjusted in this embodiment. The overall flow channel height is 4mm, except that in the central liquid cooling plate 1, the height of the flow channels corresponding to the inlet connector 4 and the outlet connector 5 is reduced from the original 4mm to 3mm.

[0098] In a preferred embodiment, the width of the inlet channel 12 and / or the outlet channel 13 is greater than the width of the main channel 11; and / or

[0099] The width of the inlet channel 12 and / or the outlet channel 13 is greater than the width of the second chamber channel 21; and / or

[0100] The width of the inlet channel 12 and / or the outlet channel 13 is greater than the width of the third chamber channel 31.

[0101] In a preferred embodiment, the height of the inlet channel 12 is less than the height of the main channel 11; and / or

[0102] The height of the outlet channel 13 is less than the height of the main channel 11.

[0103] Specifically, considering that the width of the inlet / outlet channel is slightly larger than that of other channels, in this embodiment, by reducing its height, the flow rate in the channel can be reduced, avoiding excessive cooling of the battery cell due to excessive flow, and thus preventing the phenomenon of increased temperature difference between battery cells.

[0104] When the height of the flow channel corresponding to the inlet / outlet connector 5 is reduced, it will form a stepped height change with other flow channels. Through the stepped change in the height of the flow channel, the flow distribution in the flow channel can be adjusted.

[0105] Based on Bernoulli's equation, the stepped height flow channel design can increase the refrigerant velocity in the flow channel corresponding to the inlet connector 4. When the refrigerant flows through the guide channel 7 between the central liquid cooling plate 1 and the inlet / outlet side liquid cooling plate 3, the flow-blocking effect of the baffle helps to divert the refrigerant into the cavity flow channel of the inlet / outlet side liquid cooling plate 3.

[0106] It should be noted that, since the flow channel heights on both sides of the central liquid cooling plate 1 are designed in the same way, for the sake of simplicity, only one side is shown, as detailed below. Figure 8 As shown. The height design of the water outlet channel 13 corresponding to the water outlet connector 5 in the central liquid cooling plate 1 is consistent with that of the water inlet side shown, and will not be repeated here.

[0107] In a preferred embodiment, such as Figure 5 As shown in region C, the tail ends of the inlet channel 12 and / or the outlet channel 13 are cut off, and the height of the channel that merges with the tail end cut-off point is the same as the height of the inlet channel 12 and / or the outlet channel 13.

[0108] Specifically, in order to avoid the water inlet / outlet channels affecting the flow at the confluence due to the stepped height design, in this embodiment, the tail end of the flow channel corresponding to the water inlet / outlet connector 5 is cut off to ensure that the height of the confluence channels remains consistent.

[0109] In the central liquid cooling plate 1, the inlet / outlet channels with stepped heights are designed to be at the same height as the confluence of the other channels, thereby avoiding the flow obstruction effect caused by the different channel heights at the confluence.

[0110] It should be noted that, since the tail heights of the flow channels on both sides of the central liquid cooling plate 1 are designed in the same way, for the sake of simplicity, only one side is shown, as detailed below. Figure 9 As shown. The height design of the tail end of the water outlet channel 13 corresponding to the water outlet connector 5 in the central liquid cooling plate 1 is consistent with that of the water inlet side shown, and will not be repeated here.

[0111] like Figure 10 As shown, the refrigerant flows from the water inlet connector 4 into the cavity of the central liquid cooling plate 1. When the refrigerant flows through the drainage channel 7 between the central liquid cooling plate 1 and the side liquid cooling plate, it achieves the purpose of diversion by combining the turbulence effect of the turbulence bar. Then the refrigerant flows along the preset flow channel direction. Figure 10 The direction of the middle arrow indicates the direction of refrigerant flow.

[0112] To verify the rationality of the above design scheme, a feasibility process verification was conducted. For example... Figure 11 As shown, the central liquid cooling plate 1 is connected to the inlet-side liquid cooling plate 2 and the outlet-side liquid cooling plate 3 using friction stir welding. The second plug 62, third plug 63, and fourth plug 64 are integrated into the second side beam 92, fourth side beam 94, and sixth side beam 96 respectively via friction stir welding, serving as part of the side beams. This achieves high integration, reduces the complexity of parts processing, and improves the connection accuracy between the side beams and the liquid cooling plates. Each plug is connected to the liquid cooling plate using friction stir welding. The inlet connector 4 and outlet connector 5 are connected using argon arc welding, followed by grinding. The baffle rods require positioning holes drilled on the outside of the inlet / outlet channels of the central liquid cooling plate 1. After the baffle rods are installed, they are then connected by argon arc welding. The profile liquid cooling plate is connected to the side beams using argon arc welding.

[0113] The designed profile liquid cooling plate scheme was simulated and verified. The operating condition used was an ambient temperature of 40℃, in which the state of charge (SOC) of the entire package was charged from 0% to 100% using a stepped charging method. The simulation results are as follows: Figure 12 As shown in the simulation, the NTC temperature change curve at the preset temperature monitoring point indicates that the profile liquid cooling plate effectively cools the heating cell and controls the temperature difference at the NTC point throughout the process at 4.2℃, demonstrating good temperature uniformity.

[0114] like Figure 13 As shown, in the simulation verification conditions adopted above, the global temperature difference of the battery cell is controlled within 4.6℃, indicating that the temperature uniformity of this design scheme is good and can effectively cool down the heating battery cell, meeting the design requirements.

[0115] The structural designs involved in this embodiment have all undergone feasibility process verification, exhibiting high manufacturability. Furthermore, since the inlet / outlet liquid cooling plates 3 can share the same set of processing molds, construction costs for mold opening can be reduced. The scheme design is reasonable, ensuring uniform refrigerant flow distribution and improving the temperature uniformity between the cells of the irregularly shaped power battery pack 100. This invention ultimately achieves the design requirements and solves current design challenges.

[0116] To address the issue that the overall structure of a single-chamber profile liquid-cooled plate cannot meet spatial layout requirements, two side liquid-cooled plates are added to change the single-chamber design to a multi-chamber structure design, which can meet the layout requirements of irregular and narrow spaces.

[0117] To address the issue of the monotonous flow channel structure in single-chamber profile liquid cooling plates, the flow distribution is optimized by altering the cross-sectional height of some flow channels.

[0118] To address the issues of poor temperature uniformity in battery cells due to irregular cell arrangement and localized flow dead zones in single-chamber irregular profile liquid cooling plates, the temperature uniformity of the entire battery cell pack was improved by combining multi-chamber profile liquid cooling plate structural design, flow-disrupting rod design, and design methods that changed the height of some flow channels, thus meeting the design requirements.

[0119] To address the issues of complex processing steps and difficulty in ensuring connection accuracy for plugs and connecting parts, some plugs are integrated onto the side beam, reducing the complexity of part processing and improving the connection accuracy between the side beam and the liquid cooling plate.

[0120] In a preferred embodiment of the present invention, a battery pack is also provided, including at least one battery cell and / or at least one set of modules, including the aforementioned multi-chamber flow channel profile liquid cooling plate.

[0121] Specifically, the battery pack is preferably an irregularly shaped battery pack, that is, the battery pack has irregular and narrow sides. The aforementioned multi-chamber flow channel profile liquid cooling plate takes into account both the load-bearing and cooling functions of the irregularly shaped battery pack.

[0122] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A multi-chamber flow channel profile liquid cooling plate, characterized in that, include: A central liquid cooling plate is provided with an inlet connector, an outlet connector, and a first chamber flow channel. The first chamber flow channel includes a main flow channel, an inlet flow channel communicating with the inlet connector, and an outlet flow channel communicating with the outlet connector. A water inlet side liquid cooling plate is connected to the side of the central liquid cooling plate near the water inlet channel. The water inlet side liquid cooling plate is provided with a second chamber flow channel, which is connected to the water inlet channel and the main flow channel. The water outlet side liquid cooling plate is connected to the side of the central liquid cooling plate near the water outlet channel. The water outlet side liquid cooling plate is provided with a third chamber flow channel, which is connected to the main flow channel and the water outlet channel. The width of the water inlet side liquid cooling plate and the water outlet side liquid cooling plate are matched with the width of the irregular battery pack.

2. The multi-chamber flow channel profile liquid cooling plate according to claim 1, characterized in that, The connection points of the central liquid cooling plate with the inlet-side liquid cooling plate and the outlet-side liquid cooling plate are respectively provided with flow channels to connect the second chamber flow channel to the inlet flow channel and the main flow channel, and to connect the third chamber flow channel to the main flow channel and the outlet flow channel.

3. The multi-chamber flow channel profile liquid cooling plate according to claim 2, characterized in that, The central liquid cooling plate is also provided with a baffle bar, which is located in at least one of the water inlet channel and the water outlet channel and is located downstream of the corresponding flow channel. The baffle bar is arranged along the width direction of the channel.

4. The multi-chamber flow channel profile liquid cooling plate according to claim 3, characterized in that, The baffle has a stepped structure, with the dimensions at both ends being larger than the middle dimension.

5. The multi-chamber flow channel profile liquid cooling plate according to claim 1, characterized in that, The height of the inlet channel is less than the height of the main channel; and / or The height of the outlet channel is less than the height of the main channel.

6. The multi-chamber flow channel profile liquid cooling plate according to claim 1, characterized in that, The width of the inlet channel and / or the outlet channel is greater than the width of the main channel; and / or The width of the inlet channel and / or the outlet channel is greater than the width of the second chamber channel; and / or The width of the inlet channel and / or the outlet channel is greater than the width of the third chamber channel.

7. The multi-chamber flow channel profile liquid cooling plate according to claim 1, characterized in that, The inlet channel and / or the outlet channel are cut off at their tail ends, and the height of the channel that merges with the cut-off end is the same as the height of the inlet channel and / or the outlet channel.

8. The multi-chamber flow channel profile liquid cooling plate according to claim 1, characterized in that, The flow channel edges of the central liquid cooling plate, the inlet-side liquid cooling plate, and the outlet-side liquid cooling plate are all provided with plugs.

9. The multi-chamber flow channel profile liquid cooling plate according to claim 8, characterized in that, Also includes: The frame is provided around the edge of the central liquid cooling plate, the inlet-side liquid cooling plate and the outlet-side liquid cooling plate after assembly, and the plug is integrated on the frame.

10. A battery pack comprising at least one battery cell and / or at least one set of modules, characterized in that, Includes the multi-chamber flow channel profile liquid cooling plate as described in any one of claims 1-9.

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